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介绍了一组约束钢柱抗火试验,包括试验设计、钢柱温度和位移测量结果、钢柱试验后残余变形,以及试验的数值模拟等。试验变化参数为钢柱所受约束的刚度。约束刚度大小对钢柱抗火性能的影响包括:约束刚度比大的钢柱,其屈曲温度和破坏温度均较低;钢柱屈曲后,约束刚度比大的钢柱在变形较小时即可达到新的平衡位置;约束钢柱的破坏温度一般高于其屈曲温度,且随轴向约束刚度比的增大,破坏温度与屈曲温度之差增大。试验结果与有限元分析结果进行了对比,两者吻合较好,有限元方法研究约束钢柱抗火性能具有较高的精度。
A series of steel column confined fire tests are introduced, including the design of the test, the temperature and displacement measurement of the steel column, the residual deformation after the steel column test, and the numerical simulation of the test. The experimental parameters are the stiffness of the steel column. The influence of the restraint stiffness on the fire resistance of steel columns includes: the steel columns with large restrained stiffness ratio have lower buckling temperature and failure temperature; when the steel columns buckle, the steel columns with large restraining stiffness ratio can be achieved when the deformation is small New equilibrium position. The failure temperature of the constrained steel column is generally higher than its buckling temperature, and the difference between the failure temperature and the buckling temperature increases with the increase of axial restraint stiffness ratio. The experimental results are compared with those of the finite element analysis. The agreement between the two is in good agreement. The finite element method has a higher accuracy in studying the fire resistance of the confined steel columns.